how to change the text color of currently open link and remain default color of unopened link

Introduction:

Here i will explain how to change the text color of currently open link and remain default color of unopened link.

Description:

today i will explain how to change text color in link text after link open and link hover and link click.

Example:

a:link {
    color: red;
}

a:visited {
    color: green;
}

a:hover {
    color: blue;
}

a:active {
    color: yellow;
}